Automatic demulsification oil-water separation device for heavy dirty oil in refinery dirty oil tank

Abstract

The utility model discloses a refinery sump oil tank heavy sump oil demulsification oil-water automatic separation device, which comprises a tank body, an oil-water level gauge, a control system and a discharge pipeline, the top of the tank body is provided with the oil-water level gauge, the bottom of the tank body is provided with the discharge pipeline, the discharge pipeline is provided with a valve, and the control system is connected with the control system. The control system is respectively connected with the oil-water level meter and a valve on the discharge pipeline; the problems that an existing dirty oil tank is complex in heavy dirty oil process, high in construction cost and labor cost and incapable of achieving automation of three-phase separation in the dirty oil treatment process are solved. The device disclosed by the utility model is simple in process flow, the oil-water level meter, the discharge pipeline and the stirring device are respectively controlled by the control system in a joint manner, the full automation of analysis sampling and discharge starting is realized, and the automation and efficiency of oil-water separation are improved.

Description

Technical Field

[0001] This utility model belongs to the field of oil-water separation technology, specifically relating to an automatic oil-water separation device for demulsifying heavy sludge oil in refinery sludge tanks. Background Technology

[0002] During the production, operation, and maintenance processes of petrochemical enterprises, each unit generates waste oil. This waste oil has a wide range of sources, complex properties, and is severely emulsified, containing water, chemical reagents, inorganic salts, and mechanical clay impurities, making it unsuitable for direct processing and seriously affecting the safe production and economic benefits of refining and chemical enterprises. In the treatment of emulsified waste oil, the organic and inorganic sludge released during the phase inversion of the emulsion forms dense flocs with the aggregation centers. These flocs separate into three layers under gravity: the upper layer is clear oil, the middle layer contains a large amount of organic flocculent sludge, and the lower layer consists of clear water and solid particles. In actual industrial waste oil purification, three-phase separation is a major challenge for waste oil resource utilization.

[0003] Currently, refineries mostly use storage tanks for collecting and demulsifying sludge. However, water-oil separation largely relies on manual visual inspection, and sludge accumulates quickly at the bottom of the tanks, severely impacting their usability. Patent CN1603381A discloses a method for recovering clean oil from heavy sludge, using flocculants as demulsifiers and combining them with a specific process flow. However, this method requires excessive investment from refineries, necessitating the construction of new processes and cannot be effectively integrated with existing equipment.

[0004] Patent application number 201110374364.2 discloses a method for detecting and discharging oil-water separation in heavy oil storage tanks. Although it can achieve remote control detection and automatic discharge of oil-water separation in heavy oil storage tanks, it uses a float to accurately measure the height of the gradually separating clear oil, emulsion, and wastewater in the tank. Then, it discharges the clear oil, emulsion, and wastewater through discharge pipes and valves set for each layer. Since the position of the discharge pipes set for each layer is fixed, and the source and composition of the oil pollution are relatively complex, resulting in differences from batch to batch, the height of the separated clear oil, emulsion, and wastewater is not fixed. This leads to the problem that the height of the separated clear oil, emulsion, and wastewater does not correspond to the position of the discharge pipes set on the outer wall of the tank, and thus cannot achieve sufficient separation and discharge of clear oil, emulsion, and wastewater. Utility Model Content

[0005] The purpose of this invention is to provide an automatic oil-water separation device for demulsifying heavy sludge in refinery sludge tanks. The process is simple, relying on intelligent detection instruments and a data processing center to achieve intelligent separation of the three phases after sludge treatment, thereby reducing labor costs.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution:

[0007] An embodiment of this utility model provides a device for automatic oil-water separation of heavy sludge from refinery sludge tanks, comprising a tank body, an oil-water interface gauge, a control system, and a discharge pipeline. The top of the tank body is equipped with an oil-water interface gauge, and the bottom of the tank body is equipped with a discharge pipeline. A valve is installed on the discharge pipeline, and the control system is connected to the oil-water interface gauge and the valve on the discharge pipeline.

[0008] As a further technical solution, the tank has a cylindrical cavity structure, and the top of the tank is provided with a sludge inlet.

[0009] As a further technical solution, the oil-water interface gauge is an ultrasonic oil-water interface gauge.

[0010] As a further technical solution, the bottom of the tank is also provided with a stirring device, which includes a stirring paddle rotating shaft, a stirring paddle, and a stirring paddle motor connected in sequence.

[0011] As a further technical solution, a stirring paddle support is provided at the bottom of the stirring paddle.

[0012] As a further technical solution, the discharge pipeline includes a main discharge pipeline and branch discharge pipelines. The main discharge pipeline is equipped with a main pneumatic ball valve and a centrifugal pump, and the centrifugal pump is connected to the branch discharge pipeline.

[0013] As a further technical solution, the branch discharge pipeline consists of three branch discharge pipelines, each equipped with a pneumatic ball valve, and the three branch discharge pipelines are used to discharge clear oil, emulsion and sewage respectively.

[0014] As a further technical solution, the control system is a DCS control system.

[0015] As a further technical solution, the control system is connected to the main pneumatic ball valve, the centrifugal pump, and the pneumatic ball valve respectively.

[0016] As a further technical solution, the control system is connected to the agitator motor.

[0017] The beneficial effects of the above-described embodiments of this utility model are as follows:

[0018] (1) By installing an oil-water interface gauge on the top of the tank, the changes in sludge parameters during the entire treatment process from the addition of demulsifier to the sludge-oil stratification can be monitored in real time. This avoids the need for manual judgment of clear oil, emulsion and sewage stratification based on visual inspection and smell, which is labor-intensive, subject to many human factors and affects human safety.

[0019] (2) By setting the discharge pipeline at the bottom of the tank, it is possible to fully and orderly discharge oil pollution from various sources and with complex components, resulting in different batches, and avoid the problem that the discharge pipelines fixedly set at the positions of the clear oil, emulsion and sewage separation layers on the outside of the tank do not correspond to the separation layers inside the tank.

[0020] (3) By controlling the oil-water interface gauge, discharge pipeline and stirring device in a coordinated manner, the analysis, sampling and discharge can be fully automated, thereby improving the automation and efficiency of oil-water separation. Attached Figure Description

[0021] The accompanying drawings, which form part of this specification, are used to provide a further understanding of this utility model. The illustrative embodiments of this utility model and their descriptions are used to explain this utility model and do not constitute an improper limitation of this utility model.

[0022] Figure 1 This is a schematic diagram of the structure of the device for automatic oil-water separation after demulsification of heavy sludge in the sludge tank according to this utility model;

[0023] Figure 2 This is a top view of the structure of the device for automatic oil-water separation by demulsifying heavy oil in the sludge tank according to this utility model.

[0024] The diagram is for illustrative purposes only.

[0025] The components include: tank body 1, ultrasonic oil-water interface gauge 2, agitator rotating shaft 3, agitator 4, agitator motor 5, agitator support 6, main pneumatic ball valve 7, centrifugal pump 8, pneumatic ball valve 9, and control system 10. Detailed Implementation

[0026] It should be noted that the following detailed description is exemplary and intended to provide further explanation of the present invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0027] Example 1

[0028] In a typical embodiment of this utility model, such as Figure 1 As shown, a device for automatic oil-water separation of heavy oil sludge in a refinery is provided, comprising a tank 1, which is a cylindrical cavity structure. The top of the tank 1 has a sludge inlet for adding sludge or demulsifier into the tank 1. The tank 1 is used for collecting and demulsifying the sludge. After demulsification, the oil sludge in the tank 1 automatically separates from top to bottom into an upper layer, a middle layer, and a lower layer under the action of gravity. The upper layer is clear oil, the middle layer is a flocculated oil-water mixture (emulsion), and the lower layer is water and sludge (wastewater).

[0029] An ultrasonic oil-water interface gauge 2 (a Keyence guided pulse level sensor, which works by emitting ultrasonic pulses and receiving their reflected signals to determine the liquid level) is installed at the top of tank 1. The ultrasonic level sensor is the core component, capable of both emitting and receiving reflected ultrasonic waves. During measurement, ultrasonic pulses are emitted by the sensor, and the sound waves are reflected by the liquid surface and received by the same sensor. The propagation time of the sound wave is proportional to the distance from the emitted sound wave to the surface of the object; therefore, the distance from the sensor to the surface of the measured liquid can be calculated by measuring the time difference, thus determining the liquid level. Different liquids have different ultrasonic propagation and reflection rates; the oil / water interface is determined based on the difference. The ultrasonic oil-water interface gauge 2 is used to detect in real time the parameters of the treated sludge in tank 1 under static conditions (sludge density 0.8-0.95, sludge water content 0.2-0.5; liquid density is a key factor in determining the oil / water interface), such as density, oil content, and moisture content. Once the collected data stabilizes, it can be determined that the treated sludge has completed stratification.

[0030] A stirring device is installed at the bottom of the tank 1. The stirring device includes a stirring paddle rotating shaft 3, a stirring paddle 4, a stirring paddle motor 5, and a stirring paddle support 6 connected in sequence. The stirring paddle rotating shaft 3 is located at the bottom of the tank 1. The stirring paddle 4 rotates around the rotating shaft 3 under the drive of the stirring paddle motor 5. The stirring paddle support 6 supports the stirring paddle 4, thereby maintaining a certain height between the stirring paddle 4 and the sludge in the lower layer of the tank 1. This height difference facilitates thorough mixing of the sludge and water. The stirring device is used to thoroughly mix the sludge oil and demulsifier in the tank 1, thereby improving the demulsification effect of the sludge oil.

[0031] The bottom of the tank 1 is equipped with a main discharge pipeline, which is equipped with a main pneumatic ball valve 7 and a centrifugal pump 8. The centrifugal pump 8 is connected to three branch discharge pipelines, each equipped with a pneumatic ball valve 9. The three branch discharge pipelines are used to discharge clear oil, emulsion and sewage respectively.

[0032] The ultrasonic oil-water interface level gauge 2, the stirring device, and the main pneumatic ball valve 7, centrifugal pump 8, and pneumatic ball valve 9 on the main discharge pipeline and the three branch discharge pipelines are all connected to the control system 10 (purchased from Schneider Electric's Quantum series PLC products or Zhejiang University Control System WebField control system). The control system 10 is a DCS control system. The control system controls the operating status of the stirring device, main pneumatic ball valve 7, centrifugal pump 8, and pneumatic ball valve 9 based on the sludge and oil parameters detected by the ultrasonic oil-water interface level gauge 2.

[0033] The working principle of the automatic oil-water separation device for demulsifying heavy sludge in refinery sludge tanks in this utility model is as follows:

[0034] During the oily waste collection stage, the data from the ultrasonic oil-water interface meter 2 is relatively stable and within a fixed range. After the demulsifier is added, the properties of the oily waste in tank 1 change, causing the data collected by the ultrasonic oil-water interface meter 2 to change. At this time, the control system 10 starts the stirring device according to the data change to make the oily waste in tank 1 and the demulsifier fully and evenly mixed. After the ultrasonic oil-water interface meter 2 judges that the oil / water height detection data is stable, the control system controls the stirring device to stop stirring.

[0035] In a static state, the ultrasonic oil-water interface gauge 2 transmits real-time monitoring parameters of the sludge and oil to the control system 10. When the parameters stabilize, it indicates that the sludge-oil stratification is complete. The control system 10 controls the pneumatic ball valve 7 and centrifugal pump 8 to open, and simultaneously starts the agitator motor 5 to control the agitator 4 to rotate slowly. This slow rotation of the agitator drives the lower layer of settled sludge and aqueous solution out. After the lower layer of wastewater is completely discharged, the control system 10 closes the lower layer wastewater discharge valve and simultaneously switches the valve of the middle layer flocculated oil-water mixture pipeline to discharge the middle layer flocculated oil-water mixture. Once the middle layer flocculated oil-water mixture is completely discharged, the control system 10 closes the valve of the middle layer flocculated oil-water mixture pipeline and simultaneously opens the valve of the upper layer cleaning oil pipeline. When the upper cleaning oil is completely discharged, the upper cleaning oil pipeline valve, main pneumatic ball valve 7, centrifugal pump 8, and agitator motor are closed. Preparation for the next cycle.

[0036] Ultimately, the system achieves automatic separation of water at the bottom, flocculent matter in the middle, and clear oil at the top. The device includes an ultrasonic oil-water interface gauge 2 and a DCS control system 10, enabling digital operation and intelligent oil-water separation.

[0037] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A device for automatic oil-water separation by demulsification of heavy sludge from refinery sludge tanks, characterized in that, The system includes a tank, an oil-water interface gauge, a control system, and a discharge pipeline. The top of the tank is equipped with an oil-water interface gauge, and the bottom of the tank is equipped with a discharge pipeline. A valve is installed on the discharge pipeline. The control system is connected to both the oil-water interface gauge and the valve on the discharge pipeline.

2. The apparatus for automatic demulsification and oil-water separation of heavy sludge from refinery sludge tanks according to claim 1, characterized in that, The tank has a cylindrical cavity structure, and the top of the tank is provided with a sludge inlet.

3. The apparatus for automatic demulsification and oil-water separation of heavy sludge from refinery sludge tanks according to claim 1, characterized in that, The oil-water interface gauge is an ultrasonic oil-water interface gauge.

4. The apparatus for automatic oil-water separation of heavy sludge from refinery sludge tanks according to claim 1, characterized in that, The bottom of the tank is also equipped with a stirring device, which includes a stirring paddle rotating shaft, a stirring paddle, and a stirring paddle motor connected in sequence.

5. The apparatus for automatic demulsification and oil-water separation of heavy sludge from refinery sludge tanks according to claim 4, characterized in that, The bottom of the agitator is equipped with an agitator support.

6. The apparatus for automatic demulsification and oil-water separation of heavy sludge from refinery sludge tanks according to claim 1, characterized in that, The discharge pipeline includes a main discharge pipeline and branch discharge pipelines. The main discharge pipeline is equipped with a main pneumatic ball valve and a centrifugal pump, and the centrifugal pump is connected to the branch discharge pipeline.

7. The apparatus for automatic demulsification and oil-water separation of heavy sludge from refinery sludge tanks according to claim 6, characterized in that, The branch discharge pipeline consists of three branch discharge pipelines, each equipped with a pneumatic ball valve. The three branch discharge pipelines are used to discharge clear oil, emulsion, and wastewater, respectively.

8. The apparatus for automatic demulsification and oil-water separation of heavy sludge from refinery sludge tanks according to claim 1, characterized in that, The control system is a DCS control system.

9. The apparatus for automatic demulsification and oil-water separation of heavy sludge from refinery sludge tanks according to claim 7, characterized in that, The control system is connected to the main pneumatic ball valve, the centrifugal pump, and the pneumatic ball valve, respectively.

10. The apparatus for automatic demulsification and oil-water separation of heavy sludge from refinery sludge tanks according to claim 4, characterized in that, The control system is connected to the agitator motor.

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